Equivalent relationship between php and asp objects_PHP tutorial
1) Write HTML 2) Form, Cookie and QueryString variables variables_order="EGPCS" For safety, I will not allow register_globals (set it to OFF). Then the variables are only used in the array: 3) Redirecting to another location 4) Cookie processing 5) Application variable 6) Session variable php: In PHP4 or later versions, we determine the variable as a session in For example: 7) Form variable php: $HTTP_POST_VARS["formvar"]; GET and POST variables can be automatically modified to PHP variables alternately, which is an unsafe method. 8) Server variables Request.ServerVariables("HTTP_HOST") php : As in ISAPI mode, server variables are stored in the $HTTP_SERVER_VARS array. $HTTP_SERVER_VARS["HTTP_HOST"] using ISAPI module $HTTP_ENV_VARS["HTTP_HOST"] using CGI module 9) Database access 10) Buffering 11) Script Timeout php : The time level is seconds:
asp: Response.Write(str)
php: print $str;
echo $str;
print_r $debug_str;
asp: Request object can be used.
php: These variables are automatically provided as a global variable, if configured like this in the PHP.ini file:
register_globals=On
$HTTP_POST_VARS, $HTTP_COOKIE_VARS and $HTTP_GET_VARS.
asp: Response.Redirect(url)
php: Header("Location: $url");
asp: Response.Cookies(cookiename) = newval
avar = Request.Cookies(cookiename)
php: setcookie($cookiename, $newval);
$avar = $HTTP_COOKIE_VARS [$cookiename];
asp: Application(appvarname)
php: Not provided, you can use database simulation
asp : Session(sessionname) = newval
avar = Session(sessionname)
session_register($sessionname), and then, We call session_start( )
Restore the session variable value in the .php page used at the beginning.
session_register('avar');
$avar = 99;
session_start ();
print $avar;
asp: Request.Form("formvar")
Request.QueryString("getvar")
$HTTP_GET_VARS["getvar"];
asp: There are many server variables, you can see the ASP documentation. An example:
As CGI, they are stored in environment variables, which can be obtained using the $HTTP_ENV_VARS array or getenv( )
. An example:
asp: Generally use ado technology
php: ADO can be simulated using the adodb library, which is equivalent to ado.
The limitation is that it currently supports read-only cursors and scroll forward cursors.
(annotation) can also be used directly Call the com library and see my article.
asp: Response.Buffer = true
Response.Write("abc");
Response.Flush()
php: ob_start();
print "abc";
ob_end_flush();
asp: The time level is seconds:
Server.ScriptTimeout(240)
set_time_limit(240);

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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